Windows7 can open AHCI method without reinstalling

WIN7, how to open AHCI function without reinstalling the system? I encountered a problem of asking for help, so I thought that when I installed AHCI after installing Windows7 I have encountered such a problem, and I will share the solution with you.

Problem Description:

I tried the MAC Snow Leopard on the PC before, because the MAC needs the hard disk as the ACHI interface, In the BIOS settings to change the IDE to ACHI, the result wants to return to WIN7, the tragedy found, can not enter, only change back to the IDE, so toss up is troublesome. Fortunately, I found a way to change ACHI directly without reinstalling the system.

Solution:

Open AHCI mode after modifying the registry

1. Click the “Start” button, type “regedit” in the search box, press Next Enter key, open the "Registry Editor" window. Although Windows 7 does not display the "Run" command by default in the "Start" menu, the search box can be used instead of this function (or press the Windows key + R key again).

2. In the "Registry Editor" window title bar, navigate to the HKEY_LOCAL_MACHINE\\SYSTEM\\ CurrentControlSet\\services\\msahci branch, then in the right window, double-click “Start”.

3. In the "Edit DWORD Value" dialog box that opens, change the value in the "Value Data" box from 3 to 0, and click the "OK" button.

4. Close the “Registry Editor” window and restart your computer.

5. When the computer is restarted, enter the BIOS setup interface and change the hard disk to AHCI mode. For example, for the author's computer, press F1 to enter the BIOS when starting the computer, select Devices→ ATA Drives Setup→ Configure SATA as→ AHCI, and finally press F10 to save and exit the BIOS.

After modifying the registry and enabling the hard disk AHCI mode as described above, you can start it normally without reinstalling the system. Although the startup speed of the computer will not change, when you copy a large number of files, you can see that there is a certain acceleration effect.

Summary:

Of course, there are a few points to pay attention to when doing specific operations.

Different motherboards enter the BIOS shortcut keys and the location of the AHCI item in the BIOS is different. You can read the manual attached to the motherboard to confirm.

Normally, the BIOS is enabled by default in the IDE mode of the hard disk, and AHCI is the abbreviation of Advanced Host Controller Interface, which means the advanced host controller interface, which is a technology led by Intel. It can improve the speed of SATA hard disk to a certain extent, it is recommended to open it.

In Windows Vista SP1 and later systems, the driver is automatically installed after the BIOS changes the hard disk to AHCI mode. But if you are using the operating system before Vista SP1, you need to manually load the AHCI driver through the Windows installation CD when you start the computer. If there is no installation CD for Windows system, please change back to IDE mode, download and install AHCI driver after booting the computer, then enter BIOS to change hard disk to AHCI mode.